Unique ‘Ninja’ house in Japan

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This house in Japan has been labelled as the ‘Ninja House’ as it has no walls between the rooms and the owners travel between the four-stories with ladders, instead of normal stairs. The compact design was created by Japanese architect Hiroyuki Shinozaki. Despite looking quite normal from the outside, the ‘Ninja House’ has no interior walls, not a lot of floor space and only a handful of wooden ladders to travel between the floors.